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Green circuit board with 32 black relays inside a grey ABS rail-mount enclosure

WaveShare

WaveShare Modbus RTU 32-Ch Relay Module RS485 Industrial Rail-Mount 2 in 1 accessory

SKU CH-BS1J-7Z3AH

A 32-channel Modbus RTU relay module with RS485 interface, configurable addresses 1-255, 7-36V power supply, magnetic and optocoupler isolation, TVS surge protection.

  • Cascadable RS485 control with configurable addresses 1 to 255
  • Wide 7 to 36V supply with onboard isolated regulator
  • Magnetic and optocoupler isolation for noise immunity
  • Resettable fuse and TVS suppress surges and spikes
  • 32 relays rated 10A at 250VAC or 30VDC

Industrial 32-Channel Relay Module

The WaveShare Modbus RTU module provides 32 relay channels controllable over an RS485 bus. It targets engineers and integrators building industrial automation, building-management or test systems that need reliable, isolated switching. Each channel handles 10 A at 250 VAC or 30 VDC. The rail-mount ABS case simplifies cabinet installation.

Capacity and headroom

The module accepts a 7 to 36 V supply with onboard isolation, so no separate isolated power source is required. Cascading supports up to 255 addresses on one bus, giving ample headroom for large installations. Protection includes a resettable fuse, TVS diodes, optocoupler isolation and a magnetic isolation barrier to suppress surges and transients. The flash-on/flash-off command lets a relay pulse automatically without host timing.

Upgrade path

This unit replaces banks of discrete relay boards or PLC output cards that lack integrated isolation and wide-range power input. The jump is worth it when a project needs dense, bus-addressable switching with built-in surge protection and no extra wiring for isolated supplies. It is not suited for applications requiring analogue output, high-speed PWM or direct Ethernet connectivity.

Highlights

  • Cascadable RS485 control with configurable addresses 1 to 255
  • Wide 7 to 36V supply with onboard isolated regulator
  • Magnetic and optocoupler isolation for noise immunity
  • Resettable fuse and TVS suppress surges and spikes
  • 32 relays rated 10A at 250VAC or 30VDC

Specifications

No published specifications for this item yet.

Questions about this item

Will the RS485 bus let me cascade this 32-channel relay module with my existing Modbus RTU devices using addresses 1 to 255?

Yes, the module supports configurable addresses from 1 to 255 so multiple units can share the same RS485 bus alongside other Modbus RTU gear.

How can I verify the 32 relays are switching correctly after wiring the module to 250 VAC or 30 VDC loads?

Each relay has a 10 A contact rating; send Modbus commands to toggle channels and confirm the loads respond, while the onboard optocoupler and driver chip isolate the control side from the high-voltage side.

Does the rail-mount case include the 7–36 V power supply or must I source one separately?

The onboard voltage regulator accepts 7–36 V DC, so you need to provide a supply within that range; no extra isolated supply is required for the isolated terminal.

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